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Class Information
Number: 380/41
Name: Cryptography > Communication system using cryptography > Circuit switched network (e.g., wired telephone) > Having quantizing and subsequent normalizing of signal (e.g., reentry telephone circuitry)
Description: Subject matter wherein the message signal amplitude is divided into discrete amplitude ranges which are subsequently weighted and combined.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7400724 |
Device and method for use in quantum crytography |
Jul. 15, 2008 |
| 7317796 |
System and method for video stream encryption |
Jan. 8, 2008 |
| 6959389 |
Secure entry of a user-identifier in a publicly positioned device |
Oct. 25, 2005 |
| 6947559 |
Random number generator based on turbulent convection |
Sep. 20, 2005 |
| 6801626 |
Cryptographic key distribution using light pulses of three macroscopic quantum states |
Oct. 5, 2004 |
| 6778669 |
Quantum encryption device |
Aug. 17, 2004 |
| 6711262 |
Procedure for the control of applications stored in a subscriber identity module |
Mar. 23, 2004 |
| 6701439 |
Call rejection interface for internet protocols |
Mar. 2, 2004 |
| 6498851 |
Data encryption and signal scrambling using programmable data conversion arrays |
Dec. 24, 2002 |
| 6175639 |
Digital data encode system |
Jan. 16, 2001 |
| 5995629 |
Encoding device |
Nov. 30, 1999 |
| 5668879 |
Audio scrambling system for scrambling and descrambling audio signals |
Sep. 16, 1997 |
| 5455861 |
Secure telecommunications |
Oct. 3, 1995 |
| 5434920 |
Secure telecommunications |
Jul. 18, 1995 |
| 5216692 |
Method and apparatus for adjusting a power control threshold in a communication system |
Jun. 1, 1993 |
| 5199074 |
Encryption system |
Mar. 30, 1993 |
| 5177785 |
Method and system for secure telecommunications |
Jan. 5, 1993 |
| 5159611 |
Variable rate coder |
Oct. 27, 1992 |
| 4985919 |
Secure communication control system |
Jan. 15, 1991 |
| 4979188 |
Spectrally efficient method for communicating an information signal |
Dec. 18, 1990 |
| 4852166 |
Analogue scrambling system with dynamic band permutation |
Jul. 25, 1989 |
| 4754481 |
Expanded partial response processing for analog signal enciphering and the like |
Jun. 28, 1988 |
| 4365111 |
Cipher apparatus for multiplex pulse code modulation systems |
Dec. 21, 1982 |
| 4343970 |
Signaling system |
Aug. 10, 1982 |
| 4283602 |
Cryptographically secure communication system |
Aug. 11, 1981 |
| 4278840 |
Dynamic frequency and time voice encryption system and method |
Jul. 14, 1981 |
| 4178474 |
Signaling system |
Dec. 11, 1979 |
| 4156108 |
Pulse producing system for secrecy transmissions |
May. 22, 1979 |
| 3983327 |
Electrical signaling |
Sep. 28, 1976 |
| 3983326 |
Key pulse generator for secrecy signalling circuit |
Sep. 28, 1976 |
| 3979558 |
Signaling system |
Sep. 7, 1976 |
| 3976839 |
Telephone privacy system |
Aug. 24, 1976 |
| 3968454 |
Signaling circuit |
Jul. 6, 1976 |
| 3967067 |
Secret telephony |
Jun. 29, 1976 |
| 3965296 |
Signaling system |
Jun. 22, 1976 |
| 3965297 |
Secret communication signal generating system |
Jun. 22, 1976 |
| 3953677 |
Key signaling system with multiple pulse generators |
Apr. 27, 1976 |
| 3953678 |
Speech component key signaling system with code combinations |
Apr. 27, 1976 |
| 3944744 |
Matrix coding secret signalling system |
Mar. 16, 1976 |
| 3944745 |
Secret signaling system with means for preventing key disclosure |
Mar. 16, 1976 |
| 3934078 |
Key generating system |
Jan. 20, 1976 |
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